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构造煤是煤层在构造应力作用下发生变形变质的产物,煤中元素在变形变质过程的迁移、聚集在很大程度上是对应力-应变环境的响应.基于安徽淮北海孜矿中不同变形序列构造煤样,利用XRF和ICP-MS方法测定了煤中49种元素的含量,结合煤的显微分析,探讨了不同类型构造煤中敏感元素迁移、聚集规律及其地质控制.结果表明,煤中矿物的分布和形态与构造煤变形程度有关,从弱脆性变形煤中的有序分布向韧性变形煤的无序结构演化.依据煤中元素分布特征,将构造煤中元素迁移模式分为稳定型、聚集型、散失型和复杂型等4类,元素迁移模式与构造煤类型密切相关.研究发现,构造煤的变质变形作用并未改变稀土元素(REE)的整体分布形态,但稀土元素分布随构造煤变形出现明显的动力分异现象.由此可以认为,成煤期后的构造作用、构造煤的脆性和韧性变形机制及其伴随的动热效应是影响构造煤中元素重新分配的主要因素,构造运动为元素的再次迁移提供了动力和基础,变质变形过程决控制了元素迁移的方式和途径,动热效应是煤变质作用发生的重要原因,构造应力加速了元素迁移、聚集的速率,从而使元素随煤体变形发生动力分异.
The tectonism coal is a product of deformation and metamorphism of coal seam under tectonic stress, and the elements in coal migrate during the deformation and metamorphism, and the accumulation is largely the response to stress-strain environment.Based on the different deformation sequences of Haizi Mine in Huaibei, Anhui Province, The coal samples were constructed and the content of 49 elements in coal was determined by XRF and ICP-MS. The migration and accumulation of the sensitive elements in different types of tectonic coal and their geological control were discussed in combination with the microscopic analysis of coal.The results showed that coal The mineral distribution and morphology are related to the deformation degree of tectonic coal, from the ordered distribution in weakly brittle deformed coal to the disordered structure evolution of ductile deformed coal.According to the element distribution in coal, the elemental migration patterns in tectonic coal are classified as stable Type, aggregated, dispersed and complex types, the element migration pattern is closely related to the type of tectonic coal.The study found that the metamorphism and deformation of tectonic coal did not change the overall distribution of REE, but the REE distribution With the deformation of tectonic coal obvious dynamic differentiation phenomenon.Thus can be considered, after the coal formation period tectonic effect, tectonic coal brittleness and ductile deformation mechanism and its accompanying The dynamic thermal effect is the main factor that affects the redistribution of elements in tectonic coal. The tectonic movement provides the impetus and foundation for the re-migration of elements. The metamorphic deformation process controls the way and route of element migration. The dynamic thermal effect is an important reason for coal metamorphism , The tectonic stress accelerates the rate of element migration and accumulation, so that the elements can be dynamically differentiated with the deformation of the coal body.